TTS is a revolutionary new way for CCR (Closed Circuit Rebreather) divers to estimate the amount of bailout gas they require.

It is not a dive planning concept or piece of software.  It is putting into practice a new way of calculating bailout gas based on an already determined dive schedule.

To use this software properly, you need to have taking AddHelium‘s TTS training that is provided as part of the Nomoxic and Trimix dive training classes.  If you are already a certified CCR Normoxic or Trimix diver, AddHelium also offers a shorter training class to explain the new concepts for bailout gas management.  Please see AddHelium’s training site for details.


Adding a schedule

Review a schedule with TTS bailout

Editing/Making adjustments



Adding a Schedule

To add a new schedule, let’s step back and discuss what we are really doing first.

The TTS application is not a dive planning piece of software (there are future plans to add that).  It really is just a new method for determining the correct amount of bailout gas a CCR diver needs to carry.  Having said that, what does it mean to “Add a schedule”???

We are going to add a dive plan (depth, stops and time at stops) that has been created by a previous dive planning method.  The TTS application offers 2 methods for doing this and two sample dives to demonstrate the program.  The sample dives are just that for class purposes and do not represent a real dive scenario.

To start make sure you are on the “Saved Schedules” tab.  You should see a screen like that on the left.  If this is the 1st time you have run the app, list of dives will be empty.

At the bottom of the screen is a green “+” button.  This is for adding new dives.  Press it and you will move to the add a dive screen.

Add a schedule sub-screen

Here we can now add a new dive schedule.  As stated before, there are really two options for adding a schedule (paste and manual add) and there are two examples for training purposes.

Paste From iDeco

This option will be expanded to work with other dive planning apps going forward.  However, for the 1st release of the TTS app, it works with only iDeco.

The TTS app has a very detailed help directions on how to copy and paste into the app.  Just press “Paste Help” button.

In a nutshell, here are the steps.

1. To do the iDeco app and create your dive profile.

2. Within iDeco create your dive profile.  When done, select the option to email your dive profile.  This will start the Mail app with your profile within the message body.  Select the entire message and copy into the clipboard.

3.  Now return to the TTS app and select the paste option.  This will now import the iDeco created dive plan into TTS.

Manual Enter Schedule

This is provided so you can create a complete dive plan using any technique.  Via manual tables, using any dive planning software, etc.  Once complete, you can enter each stop and stop time manually.  See Editing/Making adjustments below for details.  Basically, it is the same thing, except you are starting from scratch.

With this option, you first enter the name of the dive, set the Max Depth (+ or -) and your bottom time (+ or -).  The run time starts out as whatever you set your bottom time as.

After you have setup your basics, press the “1st Gen” button at the bottom of the screen.  This will generate stops at 10 foot intervals starting 10 feet above the max depth.  You will need to manually enter the amount of time at each stop and if it is a stop or an ascent entry.  See Editing/making adjustments for details.

Ascent vs Deco.

This is more of a reference piece of information than anything.  You know from intro diving classes that you should ascent about 33 feet a minute.  Therefore, you might want to just mark one minute every 30 feet of ascent settings and leave the others as zero.  Again, for reference purpose and to help TTS calculate the amount of gas required.  Once you get to your 1st stop (according to your planning technique or software), then have the slider set to Deco for all remaining stops.

Add example dives

The sample 200 and 300 foot dives are for class room purposes only.  They will enter a sample dive profile so you can look at the results.

Review a schedule with TTS bailout

From the main tab (Saved Schedules) you can select any saved dive to review its information.  The key information for dive planning in in the summary section.  It contains the required bailout gas in cubic feet based on TTS’s formula.

Summary section

This section contains many items from the dive that was planned using external software or techniques.  Max depth of the dive, max bottom time (time spent at max depth) and total run time (max bottom time + all the time spent at the required deco stops).

In addition there are two new pieces of information.  Lean Mix Required and Deco Mix Required.  This is the amount of gas required to be carried for emergency bailout.  How this number is created is based on your TTS settings and is explained within the TTS course taught by Add Helium.  If you feel this is not enough gas for an emergency bailout, please consult your original dive planning software.  Remember TTS is a new method of planning and might be considered aggressive until you have taken the class and understand the logic/math behind the numbers.

Bail out schedule section

This just list out the same information your dive planning process/software provided.  Each stop and time spent there.  You can scroll through the entire schedule to see each stop.  If you select a decompression stop, a dialog window will pop-up to display more details about that stop.  Of most interest, it will explain how much deco or lean gas would be used at that stop.  Not necessary for dive planning, but interesting to see the amount consumed based on the atmosphere,

At the bottom of the screen are editing options.  Rename, delete, edit and send schedule via email.  These are fairly self-explanatory.

Editing/Making Adjustments

When “Edit” button is selected from reviewing a schedule, edit edit screen pops up.  This screen allows you to change many aspects to “tune’ the dive.  At this point, you have taken control into your own hands and are leaving the schedule that was recommended by your dive planning technique or software.  That is OK, some people want to extend stop times at various depths for safety purposes, or to slow their ascent time prior to hitting the 1st stop.

When editing a (as opposed to adding a new dive), you can only change the name of the dive and the amount of time (+ or -) spent at each stop.  You are not allowed to change the original max depth or bottom time.  The Run Time value, will auto adjust based on your changes.

When done, press save.  This will return you to reviewing the dive, however the bailout gas amounts should be updated to reflect your changes.


The “Settings” tab is where you configure TTS.  These settings are explained in detail in the Add Helium TTS training class as to why they are important to planning out the required bailout gas needs.

Note.  The adjustment of these settings will have a direct relationship to the bailout gas required as calculated by the TTS app.

TTS Trained

Very self-explanatory.  However, the application will not work unless you certify you have been trained.


This is the same RMV that you learn about in your 1st open water diving class.  It is also referred to as SAC rate in some training programs.

Deco Depth

This is the depth you plan to start your major decompress on your main decompression gas.  I.e.,  you are moving from a slow multi-stop ascent to using your richer decompression gas.  The type of gas used is based on your decompress class training.

Lean Multiplier

This is the multiplier used for when you are consuming your ascent gas.  The purpose of the multiplier is covered in your TTS training.

Deco Multiplier

This is the multiplir used for when you are consuming your richer decompression gas.  The purpose of the multiplier is covered in your TTS training.


If you have questions about the TTS concepts and training, please contact Add Helium to setup a class.

If you have completed your training, and still have questions about the TTS iPhone app, please send an email to
with your questions.

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